Question 84723
First, we substitute x=-2 into the polynomial and we get:

{{{(-2)^3-4(-2)}}}

Look at the first term:
{{{(-2)^3=(-2)(-2)(-2)=(+4)(-2)=-8}}}

Look at second term

{{{-4(-2)=+8}}}

Now let's put the two terms back together:

-8+8=0---------------------ans

Hope this helps----ptaylor